KanjiBox is an iPhone app developed by Dave duVerle that provides an all-encompassing way to study Japanese. The app offers drills, quizzes, and flashcards for all aspects of Japanese language learning, including kana, kanji, vocabulary, reading, and writing. KanjiBox also offers live stats, progress charts, and achievements for each Japanese level, making studying an engaging and rewarding experience.

One unique feature of KanjiBox is its adaptative learning system, which focuses on the user's weak points and uses spaced repetition techniques to help them learn faster. The app also includes online scoreboards, custom study sets, and additional modules for handwriting practice. With over 6,000 kanji, 34,000 vocabulary words, and both hiragana and katakana, KanjiBox is particularly well-suited for standardized test preparation, but works great as a personal study tool too.

Overall, KanjiBox is a comprehensive and efficient way to study Japanese, offering a variety of features and tools to aid in language learning.